Should I worry?

Thank you in advance for everyone’s advice on this. I’m currently just over 10 weeks with my first baby. We have been trying for 6 years and are over the moon about it! Today I went for a walk with my husband and for half of the walk I was trying to keep up with him. We finally slowed down once I told him I was having issues with getting tired.

About 10 minutes after our walk I noticed some tightening soreness in what I think is from my pelvic area? It’s just lower. I feel it mostly only when I walk. I’m honestly just worried if I did something wrong.

Has anyone had this happen to them? Is it normal??